Abstract
Application of the recently introduced Baltic δ 13 C isotope zonation to a composite North American Darriwilian through Hirnantian succession shows that in most intervals there is good trans-Atlantic agreement not only between the isotope zones but also with the available biostratigraphic data. This indicates that this isotope zonation is a useful tool for improving previously uncertain long-distance correlations.
Highlights
Recent extensive geochemical investigations in several parts of the world have firmly established the usefulness of δ13C chemostratigraphy for both local and longdistance correlations of Ordovician sedimentary rock successions
The Guttenberg (GICE) and the Mid-Darriwilian (MDICE) isotopic carbon excursions have proved to be useful for global correlations (e.g. Bergström et al 2010b; Schmitz et al 2010; Albanesi et al 2013)
The application of the Baltic isotope zones to the North American study successions is illustrated in Fig. 1 and briefly discussed below starting with the base of the study interval
Summary
Recent extensive geochemical investigations in several parts of the world have firmly established the usefulness of δ13C chemostratigraphy for both local and longdistance correlations of Ordovician sedimentary rock successions. The fact that there is no reasonably stratigraphically complete succession in one place in North America that can provide a stratigraphically continuous δ13Ccarb curve makes it necessary for a trans-Atlantic comparison to employ a composite curve covering the uppermost Dapingian through the Hirnantian interval. For this composite curve we use curves from sections in the eastern Appalachians of Virginia (Leslie et al 2011), the Cincinnati region in the eastern Midcontinent (Bergström et al 2010b) and western Anticosti Island (Young et al 2010). For reviews of aspects of the detailed biostratigraphy established for the Baltoscandia successions, see Ebbestad & Högström (2007) and Männik & Viira (2012)
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